You know you're addicted to Fiesta when you have a dream pairing yourself with one of your favorite anime characters going on a mission... and he's a fighter and you're a cleric healing him.
1) you are a party and you tell people "Shut up, I'm dying!"
2) You find yourself explaining to your friends why spending 5hrs+ to get an item or title was worth it every single second of it
You know you're addicted to Fiesta when you're decorating your Christmas tree and start wondering what kinds of Fiesta-related ornaments you could come up with.